Back

Weather Alert Detail

  • Special Weather Statement for South Willamette Valley County, Oregon
  • Special Weather Statement issued May 18 at 4:06AM PDT by NWS
  • Effective: Monday, May 18, 2015 at 4:06 a.m.
  • Expires: Monday, May 18, 2015 at 3 p.m.
  • ...SCATTERED THUNDERSTORMS WITH LOCALIZED HEAVY RAIN EXPECTED
    THIS AFTERNOON AND EVENING...
    WARMER TEMPERATURES WILL RESULT IN AN UNSTABLE AIR MASS THIS
    AFTERNOON...WITH SCATTERED THUNDERSTORMS EXPECTED TO DEVELOP
    ACROSS INLAND AREAS OF SOUTHWEST WASHINGTON AND NORTHWEST OREGON.
    THUNDERSTORMS SHOULD FIRST DEVELOP IN THE CASCADES DURING THE
    MIDDAY AND EARLY AFTERNOON HOURS...WITH ADDITIONAL SHOWERS AND
    THUNDERSTORMS DEVELOPING OVER THE COAST RANGE AND WILLAMETTE
    VALLEY LATER THIS AFTERNOON. SHOWERS AND THUNDERSTORMS MAY
    CONTINUE INTO THE EVENING HOURS BEFORE DISSIPATING WITH THE LOSS
    OF DAYTIME HEATING.
    ANY THUNDERSTORMS WHICH DEVELOP WILL HAVE ACCESS TO PLENTIFUL
    MOISTURE WRAPPING AROUND A BROAD LOW PRESSURE SYSTEM ENCOMPASSING
    MUCH OF THE WESTERN UNITED STATES. ADDITIONALLY SHOWERS AND
    THUNDERSTORMS SHOULD BE SLOW MOVING DUE TO THE LACK OF ANY
    SIGNIFICANT STEERING FLOW. GIVEN THESE FACTORS...THERE IS SOME
    CONCERN FOR HIGHLY LOCALIZED URBAN AND SMALL STREAM FLOODING IN
    AREAS AFFECTED BY THESE HEAVIER SHOWERS AND THUNDERSTORMS.
    THE BEST CHANCE OF THESE HEAVIER SHOWERS AND THUNDERSTORMS
    OCCURRING IN THE WILLAMETTE VALLEY WILL BE LATE THIS AFTERNOON...
    JUST IN TIME FOR THE LATE AFTERNOON COMMUTE. THE PORTLAND...SALEM
    AND EUGENE METRO AREAS MAY BE AFFECTED. HEAVY DOWNPOURS WOULD
    LIKELY CAUSE SOME MINOR TRAVEL ISSUES DUE TO PONDING ON ROADWAYS.
    VISIT WEATHER.GOV/PORTLAND OR YOUR FAVORITE SMARTPHONE WEATHER APP
    FOR UPDATED INFORMATION REGARDING IF...WHERE...AND WHEN THESE
    STORMS MAY AFFECT YOUR AREA.

  • Special Weather Statement for South Willamette Valley County, Oregon
  • Special Weather Statement issued May 18 at 4:06AM PDT by NWS
  • Effective: Monday, May 18, 2015 at 4:06 a.m.
  • Expires: Monday, May 18, 2015 at 3 p.m.
  • ...SCATTERED THUNDERSTORMS WITH LOCALIZED HEAVY RAIN EXPECTED
    THIS AFTERNOON AND EVENING...
    WARMER TEMPERATURES WILL RESULT IN AN UNSTABLE AIR MASS THIS
    AFTERNOON...WITH SCATTERED THUNDERSTORMS EXPECTED TO DEVELOP
    ACROSS INLAND AREAS OF SOUTHWEST WASHINGTON AND NORTHWEST OREGON.
    THUNDERSTORMS SHOULD FIRST DEVELOP IN THE CASCADES DURING THE
    MIDDAY AND EARLY AFTERNOON HOURS...WITH ADDITIONAL SHOWERS AND
    THUNDERSTORMS DEVELOPING OVER THE COAST RANGE AND WILLAMETTE
    VALLEY LATER THIS AFTERNOON. SHOWERS AND THUNDERSTORMS MAY
    CONTINUE INTO THE EVENING HOURS BEFORE DISSIPATING WITH THE LOSS
    OF DAYTIME HEATING.
    ANY THUNDERSTORMS WHICH DEVELOP WILL HAVE ACCESS TO PLENTIFUL
    MOISTURE WRAPPING AROUND A BROAD LOW PRESSURE SYSTEM ENCOMPASSING
    MUCH OF THE WESTERN UNITED STATES. ADDITIONALLY SHOWERS AND
    THUNDERSTORMS SHOULD BE SLOW MOVING DUE TO THE LACK OF ANY
    SIGNIFICANT STEERING FLOW. GIVEN THESE FACTORS...THERE IS SOME
    CONCERN FOR HIGHLY LOCALIZED URBAN AND SMALL STREAM FLOODING IN
    AREAS AFFECTED BY THESE HEAVIER SHOWERS AND THUNDERSTORMS.
    THE BEST CHANCE OF THESE HEAVIER SHOWERS AND THUNDERSTORMS
    OCCURRING IN THE WILLAMETTE VALLEY WILL BE LATE THIS AFTERNOON...
    JUST IN TIME FOR THE LATE AFTERNOON COMMUTE. THE PORTLAND...SALEM
    AND EUGENE METRO AREAS MAY BE AFFECTED. HEAVY DOWNPOURS WOULD
    LIKELY CAUSE SOME MINOR TRAVEL ISSUES DUE TO PONDING ON ROADWAYS.
    VISIT WEATHER.GOV/PORTLAND OR YOUR FAVORITE SMARTPHONE WEATHER APP
    FOR UPDATED INFORMATION REGARDING IF...WHERE...AND WHEN THESE
    STORMS MAY AFFECT YOUR AREA.